Effect of ionic liquid on the extraction of lanthanides(III) from nitric acid solutions with phosphoryl-containing podands

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Abstract

The effect of the ionic liquid, 1-butyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide, on the extraction of lanthanides(III) from nitric acid solutions with phosphoryl-containing podands (2-(2-diphenylphosphoryl)-4-ethylphenoxy)methyl)diphenylphosphine oxide (1), (2-(2-diphenylphosphoryl)-4-ethylphenoxy)ethyl)diphenylphosphine oxide (2), and 2-[2-(diphenylphosphoryl)-4-ethylphenoxy]-N, N-dioctylacetamide (3) was studied. The stoichiometry of the extracted complexes was determined. The efficiency of extraction of lanthanides(III) with solutions of compounds 1–3 in dichloroethane from nitric acid solutions increases in the order 3 < 2 < 1. It has been established that, when replacing dichloroethane with an ionic liquid as a diluent, the extraction efficiency increases. The magnitude of this effect decreases in the series of compounds 3 > 2 > 1. In the case of compound 1, the replacement of dichloroethane with an ionic liquid as a solvent is accompanied by a decrease in the extraction of lanthanides(III) at [HNO3] > 1.5 M.

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About the authors

A. N. Turanov

Ossipyan Institute of Solid State Physics, Russian Academy of Sciences

Email: mager1988@gmail.com
Russian Federation, Chernogolovka, Moscow oblast, 142432

V. K. Karandashev

Institute of Microelectronics Technology and High Pure Materials, Russian Academy of Sciences

Email: mager1988@gmail.com
Russian Federation, Chernogolovka, Moscow oblast, 142432

V. E. Baulin

Institute of Physiologically Active Substances of the Russian Academy of Sciences

Author for correspondence.
Email: mager1988@gmail.com
Russian Federation, Chernogolovka, Moscow oblast, 142432

D. V. Baulin

Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences

Email: mager1988@gmail.com
Russian Federation, 119991, Moscow, 119991

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3. Formula

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4. Fig. 1. Dependence of the distribution coefficients of Ln(III) on the concentration of HNO3 in the aqueous phase during extraction with 0.01 mol/l solutions of compound 1 in dichloroethane.

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5. Fig. 2. Dependence of the distribution coefficients of Eu(III) on the concentration of HNO3 in the aqueous phase during extraction with 0.05 mol/L solutions of compounds 1 (1, 3), 2 (4, 5) and 3 (2, 6) in dichloroethane (1, 5, 6) and in C4mimTf2N (2–4).

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6. Fig. 3. Distribution coefficients of Ln(III) during extraction from a 3 mol/L HNO3 solution with 0.05 mol/L solutions of compounds 1(1, 2), 2 (4, 5), and 3 (3, 6) in dichloroethane (1, 5, 6) and in C4mimTf2N (2–4).

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7. Fig. 4. Distribution coefficients of Ln(III) during extraction from a 0.003 mol/L LiTf2N solution with 0.002 mol/L solutions of compounds 1–3 in dichloroethane.

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8. Fig. 5. Distribution coefficients of Ln(III) during extraction from a 0.01 mol/L HNO3 solution with 0.01 mol/L solutions of compounds 1–3 in dichloroethane containing 0.05 mol/L C4mimTf2N.

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